ka.concept: Fixes typo.
ka.concept: Fixes typo.

Range's pop is an action, therefore it takes a non-const reference.

Change-Id: I1be7ada9412ba5a400263b362e3c1357d7aca62d
Reviewed-on: http://gerrit.aldebaran.lan/92506
Reviewed-by: julien.bernard <ea5260c7e0323127ccaf17b0a52809b76a619578@external.softbankrobotics.com>
Reviewed-by: vincent.palancher <f8ff75e1c61314c499fafa8de0d9e004e87e66b0@softbankrobotics.com>
Tested-by: jmonnon <8898eaf233516e520f996a244ca8a12d20f948b1@aldebaran.com>

aldebaran/libqi,aldebaran/libqi,aldebaran/libqi